Measurement Variation Analysis and Uncertainty Estimation in Single Cylinder Engine block using Coordinate Measuring Machine
Nilesh P. Patil1, V.A. Kulkarni2

1Mr. Nilesh P. Patil, Post Graduate Student, Department of Production Engineering, D.Y. Patil College of Engineering, Akurdi, Pune (Maharashtra), India.
2Prof. V.A. Kulkarni, Head, Department of Production Engineering, D.Y. Patil College of Engineering, Akurdi, Pune (Maharashtra), India.
Manuscript received on 10 July 2016 | Revised Manuscript received on 21 July 2016 | Manuscript Published on 30 July 2016 | PP: 1-5 | Volume-6 Issue-2, July 2016 | Retrieval Number: B2326076216/16©BEIESP
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Abstract: Due to the measurement errors objectively existing, measurement result deviates from ‘‘true value” of the measurand. As measurement devices also shows measurement errors, a measurement result will never be exact. This means there will always be a measurement uncertainty that must be taken into account while evaluating conformance of products to tolerances. If the measurement uncertainty is neglected, this can result in false rejection or false acceptance of products, with possibly far-reaching consequences. Measurement uncertainty determination for coordinate measuring machines is difficult because of the many uncertainty contributors such as CMM hardware errors, temperature, measurement strategy etc. that are involved and these are affecting on the performance of the CMM which is nothing but the uncertainty involved in the process. This paper indicates what the uncertainty in the measurement is, standard types of uncertainty and how to calculate the budget for uncertainty with standard component i.e. single cylinder engine block assembly. With reference to the Guide to the expression for uncertainty in measurement (ISO GUM), the process is followed with Type-A and Type-B standard uncertainty by the statistical analysis of series of observations taken and by means other than the statistical analysis of series of analyzing the results, we had found that the max. Expanded uncertainty for bore diameter, concentricity &cylindricity is observed as ± 2.9331 μm, ± 2.9721 μm & ± 2.9250 μm respectively.
Keywords: Coordinate Measuring Machine (CMM), ISO GUM, Measurement Uncertainty, Required Accuracy, Uncertainty Analysis.

Scope of the Article: Measurement & Performance Analysis